Universal mortise and boring jig for door locks



1N VEN TOR.

/QTTOBNEYS EUGENE e. eusfro/v,

July 15, 195s Filed /June i, 1956 Jul'y i5, 1958 E. R. RUsHToN 2,843,167

UNIVERSAL MORTISE AND BORING JIG FOR DOOR LOCKS 2 Sheets-Sheet 2 Filed June l, 1956 Unite States Patent UNWERSAL MOR'HSE AND BRING JIG FOR DOOR LOCKS Eugene E. Rushton, Houston, Tex.

Application June 1, 1956, Serial No. 588,771

2 Claims. (Cl. 1414-76) This invention relates to an improved mortise and boring jig for use in installing, on such as flush doors, tubular and cylindrical locks having different back-sets of operating knobs.

Because of requirements of mass production and stepped-up building schedules in the home building industry, and scarcity of skilled labor, such as carpenters, there is a demand for means to reduce the elements of error in building practices so as to eliminate loss of time as well as waste of material. Installation of hardware on new doors, although appearing to be relatively simple, is an operation which requires accuracy and skill, and when not done properly can result in waste of time and material which increase the cost of construction. The home building industry, for example, uses tubular and cylindrical locks. with various amounts of knob back-set for the purposeV of affording a greater degree of balance or application of force when the door is manipulated, aswell as providing a highly desirable aesthetic appearance. have latchbolts up to eighteen inches in length, requires a great dealV of accuracy in order to obtain proper func'- tioning thereof.

The primary object of the invention is to provide aunitary and more practical and eflicient mortise and boring jig for installing back-set locks, which has means for easily and expeditiously scribing a mortise for a latchboltvplate, drill bit guide means for boring a transverse latch-bolt bore in the vertical edge of a door in its proper oriented position relative to the lock-latch plate,

and drillfbit guide means for boring a transverse lock y assembly bore through opposite side portions of a door in intersecting relationship to the latch-bolt bore for receiving alock assembly therein, which includes a backset door-V knob and the latch mechanism of the lock, and. means for retaining the jig in a proper oriented position relative to a lock assembly bore.

AnotherV object of the invention is to provide in a device of the character indicated, replaceable means for accommodating ditferent diameter latch-bolts as well as diferent sized latch-bolt plates, and extensible drill guide means for facilitating the installation of back-set lock assembliesin properly orientated positions for different length latch-bolts. l

A- further` object of the invention is toV provide in a device of the character set forth, improvedv means for orientating back-set lock assemblies having exceedingly long' latch bolts, and means for facilitating installation of lock assembliesin doors having bevelled vertical edges.-

A still further object of the invention is to provi-de a device ofthe character set forth which can be made in rugged and'serviceable forms at relatively low cost, is easily used and maintained, and is highly accurate, efficient andsatisfactory for the purpose intended.

These'together with other objects and advantages which will become apparent reside in the details of construction and operation as more fully hereinafter described' An installation of back-set locks which may "ice 2 and claimed, reference being had to the accompanying ydrawings forming a part hereof, wherein like numerals refer to like parts throughout the several views, and in which:

Figure 1 is a top plan view of a mortise and boring jig in accordance with the present invention, positioned on the vertical edge' of a door upon which a back-set lock is to be installed;

Figure 2 is a side elevational view of Figure 1 with portions broken away and in section, showing the jig extended in phantom lines, to accommodate for installation of a back-set lock having-a lo'ng latch-bolt;

Figure 3 is a contracted fragmentary horizontal sectional view taken substantially on line 3-3 of Figure 2, with a portion of the clamping handle removed;

Figure 4 is a fragmentary end elevational view, looking from left to right in Figure 2;

Figure 5 is a fragmentary transverse vertical sectional view taken substantially on line 5-5 of Figure 2;

Figure 6 is a side elevational view, on a reduced scale, showing extension-means incorporated in the jig for use in installing back-set lock assemblies having relatively long latch-bolts;

Figure 7 is a fragmentary sectional view similar to the Figure 3, showing means for accommodating the jig to' a door having a beveled vertical edge; and

Figure 8 is an enlarged perspective view of a wedgel component of the means of Figure 7.

Referring to the drawings in detail, there is shown a` fragmentary portion of-a door 10 having a vertical edge- 12, and opposite sides 14- and 16, and being of the type to have installed thereon a back-set lock, with the aid of amortise andboring` jig, indicatedv generally at 1.8. The jig 1S comprises a rectangular back 20 having extending. through opposite sides 22 andl 24 a transverse boreV 26, see Figures l and 3, which has journaled therein a transverse clamping screwV 2S having oppositely threaded` end portions 30 and 3,2;` On one end of the screwy 23 is an Unthreaded' terminal 34y oh which is secured a. cruciform handle 36, as clearly sh'ow'n in Figures l and 2.

v Located at opposite-sides of the block Ztl are similar elongated rectangularplate-assemblies 38rwhich comprise mounting` plates 42 havingy oppositely threaded aligned holes 46 in which are threaded the oppositely threaded portions 30 and 32 of the clamping screw 28, so that rotation of the screw 28V by means of the handle 36 produces movement of the clamping plate assemblies toward and away from each-other'. In order toy prevent rotation ofI the clamping plate assemblies about the clamping screw 23 when the screw is rotated, the block'v 2.0 has slidably extendingv therethrough and through theA plates i2 parallel tothe bore-'26 a pair ofvertically spaced horizontal rods 50 and 52.

The plates 42vhave inner ends S4inwhich are notches 56 which receive therein suitably shaped projections 58':

on drill bitguideA plates 60, The plates`60, as shown in Figure 2, have upper and lower horizontal slots 6'2 and 64, above and` below the projections 5S, which receive horizontal arms 66 and' 68, respectively, o'n the inner ends S4 of the plates 42.',- the arms-66'a.nd 68 being' defined by the notches 56. As shown in Figures 2, d*

and 5, the upper edges of the plates 42 Vhave thereon reduced width ribs or tracks 78whichy are-received slidably withinV grooves 76 in the undersi'des of elongated bars '72 on and projecting from the outer ends of thev plates 6h.

82 in which-are slidably engaged tracks or ribs 80 on ln thelower edges of the plates 42e-re grooves elongated bars 74 projecting from` the outer ends of the pistes 6a'. Y,

The drillbit guide plates have thereon transversely aligned drill bit openings 84 which may have suitably secured therein bushings 86 of any suitable character to resist excessive wear by drill bits used therein for the purpose of drilling a hole through a door for accommodating the latch mechanism of a back-set lock to be installed. In order to provide additional support for the jig, especially when a lock having an exceedingly long latch bolt is to be installed, the plates have in spaced relationship to the device bit guide opening 84, a plurality of small threaded holes 88 for end-pointed screws (not shown) for engaging the opposite sides of the door 10 for retaining the jig relative to the knob position of a lock assembly.

Extending vertically through the bars 72 and 74 on the plates 60 are pluralities of longitudinally spaced threaded holes 90 which receive therein locking screws 92 which are engageable in detent recesses 94, see Figure 2, in the related upper and lower edges of the plates 42, so as to retain the plates 60 in retracted or extended positions, such as shown in phantom lines in Figure 2, for the purpose of locating the drill guide openings 84 at a greater `distance inwardly from the edge 12 of the door for drilling a hole therein for a lock having an exceptionally long latch bolt.

Because building specifications generally call for locks having latch bolts of substantially conventional or uniform lengths, a scale 96 may be provided on the plates 42, see Figure 6, and a suitable pointer 98 may be provided on the upper bars 72 of the plates 60. The detent recesses 94 are located and spaced in relation to the marks of the scale 96 and to the pointer 98.

In the event it is necessary to install a back-set lock assembly having an exceedingly long latch bolt, such as, seven, ten or eighteen inches long, the mounting plates 42, see Figure 6, may have mounted on their upper and lower edges by means of locking screws 92, removable extension assemblies 100 having upper and lower bars 101 and 103 having groove and rib means (not shown) similar to those on the bars 72 and 74 on the plates 60, as shown in Figure 5, providing for mounting of extension drill bit guide assemblies 100 on the plates 42 in the places of the plates 60. The extension bars 101 and 103 have laterally inwardly offset portions 104 and 106, respectively, on which the bars of the plates 60 are adapted to be mounted in the same way `as on the upper and lower edges of the plates 42, whereby the drill bit guide openings of the plates 60 can be reached to and supported at the necessary distances inwardly from the edge 12 of a door 10, for an extra long lock bolt.

The block 20 has formed in its inner end 108 a recess which may be rectangular, as shown, or any other suitable form, which receives therein a miter blade assembly indicated generally at 112. The miter blade assembly 112 is utilized for scribing or cutting out a recess in the vertical edge 12 of a door 10 for accommodating a latch bolt plate of a back-set lock assembly. The miter blade assembly 112 includes a plate 114 having extending transversely therethrough suitable holes 115 receiving therethrough retaining screws 116 to be secured in suitable threaded holes 117 in the bottom of the recess 110. Extending about the periphery of the plate 114 of the miter blade assembly and normal thereto is a peripheral cutter blade 118 having a cutting edge 119 which extends beyond the end 108 of the block 20 and which can penetrate into the door edge 12 for cutting therein a recess for a latch bolt plate. The outer end 128 of the block 20 has projecting therefrom vertically spaced anvils 130 and 132 adapted to be struck by a hammer for driving the cutter blade 118 into the door edge 12.

In the event that the vertical edge 12 of a door 10 is beveled, as indicated in dotted lines in Figure 7, it is necessary to set the miter blade assembly 112 and the cutting blade 118 thereof parallel to the door edge.

This is accomplished by inserting behind the blade plate 114 of the miter blade assembly a suitably shaped wedge 124 which has the same angularity as the door edge, and has therein openings 126 for accommodating screws 1.16. Although a separate wedge element 124 has been shown for the purpose of cooperating with the beveled edged doors, the miter blade assembly could be made with such portion integral therewith and thus the miter blade assemblies would be interchangeable depending upon the type of door used.

The block 20 has extending through the outer end 108 a longitudinal bore 134 which opens at its inner end into the recess 110 and communicates with a central hole 136 in the plate 114 of the miter blade assembly. Disposed through the bore 134 and through the hole 136 removable tubular bushing 138 for guiding drill bits for drilling bores in the door edge 12 for latch bolts of back-set lock assemblies. As shown in Figure 8, the wedge 124 includes a central hole 140 for accommodating therethrough the bushing 138 when the wedge is in use in recess 110.

In order to prevent the bushing 138 from being withdrawn from the block 20 an annular retaining collar 142 is secure-d to the block 20 and has an inturned end portion 144, see Figure 2, which is engageable around the outer end 146 of the bushing 138. The bushings 138 may be of varying inside diameters for accommodating varying diametered latch-bolts of diiferent lock assemblies.

The foregoing is considered 'as illustrative only of the principles of the invention. Since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly all suitable modifications and equivalents may be resorted to, as fall within the scope of the appended claims.

What is claimed is:

l. In a mortise and boring jig, a block having parallel sides and inner and outer ends, said block having a transverse journal bore opening through said sides, a pair of similar clamping plate assemblies engaged with said sides of the block and extending longitudinally inwardly beyond said inner end of the block, said assemblies having aligned oppositely threaded holes therethrough aligned with said journal bore, a transverse clamping screw journaled in said journal bore and having oppositely threaded end portions threaded in said threaded holes, means on an end of said screw for rotating the screwl in opposite directions to move said assemblies toward and away from each other, and means for engaging said block and said assemblies for preventing rotation of the assemblies on the clamping screw, said assemblies comprising relatively stationary mounting plates containing said threaded holes, said mounting plates having inner ends and upper and lower longitudinal edges, and drill bit guide plates positioned at the inner ends of the mounting plates, said guide plates having outer ends, said guide plates having longitudinal arm means extending outwardly beyond their outer ends and supportably engaged with the upper and lower longitudinal edges of the mounting plates, said guide plates having therein transversely aligned drill bit guide holes, longitudinal rib and groove means acting between said arm means and the upper and lower edges of the mounting plates and mounting the guide plate arm means on the edges of the mounting plates, locking screws traversing said arm means, and detent recesses in the longitudinal edges of the mounting plates selectively engageable by the locking screws to hold the guide plates in longitudinally adjusted relations to the mounting plates.

2. In a mortise and boring jig, a block having parallel sides and inner and outer ends, said block having a transverse journal bore opening through said sides, a

5 i pair of similar clamping plate assemblies engaged with said sides of the block and extending longitudinally inwardly beyond said inner end of the block, said assemblies having aligned oppositely threaded holes therethrough aligned with said journal bore, a transverse clamping screw journaled in said journal bore and having oppositely threaded end portions threaded in said threaded holes, means on an end of said screw for rotating the screw in opposite directions to move said assemblies toward and away from each other, and means for engaging said block and said assemblies for preventing rotation of the assemblies on the clamping screw, said assemblies comprising relatively stationary mounting plates containing said threaded holes, said mounting plates having inner ends and upper and lower longitudinal edges, and drill bit guide plates positioned at the inner ends of-the mounting plates, said guide plates having outer ends, said guide plates having longitudinal arm means extending outwardly beyond their outer ends and supportably engaged with the upper and lower longitudinal edges of the mounting plates, said guide plates having therein transversely aligned drill bit guide holes, longitudinal rib and groove means acting between said arm means and the upper and lower edges of the mounting plates and mounting the guide plate arm means on the edges of the mounting plates, locking screws traversing said arm means, and detent recesses in the longitudinal edges of the mounting plates selectively engageable by the locking screws to hold the guide plates in longitudinally adjusted relations to the mounting plates, said arm means comprising longitudinal arms fixed on and projecting beyond the outer ends of the guide plates, longitudinally elongated extension arms having outer end portions which said rib and groove means mount on the upper and lower edges of the mounting plates, said extension arms having laterally inwardly oftset rear end portions, with the xed arms of the guide plates mounted longitudinally on said rear end portions.

References Cited in the le of this patent UNITED STATES PATENTS 

